The transmission is initially filled with Type "00" transmission grease. Then if it needs to be topped-off you use 50wt motor oil.

The engine can use 20w-50 motor oil. I think the originial specifications called for different oil in summer and winter back then, and would depend on the temperature conditions for straight weight oils.The primary can use 30wt motor oil.

The engine fill level is shown on the dipstick.The primary and transmission are filled until they just barely start to run out of the level-setting holes on the sides.

The manual I have says 30w winter 50w summer for engine.40w for transmission. 10w for primary.Transmission fill to level plug.Primary fill to lower small plug.Engine oil tank 2" below top of filler. ERC

The manual I have says 30w winter 50w summer for engine.40w for transmission. 10w for primary.Transmission fill to level plug.Primary fill to lower small plug.Engine oil tank 2" below top of filler. ERC

Good post, ERC.My info was not from a manual.I was just going by the seat of my pants.

Was wondering jade do you have a trailblazer that is running?If you have one that has recently been rebuilt you could use the multi weight oil that ACE suggested.If moter has some time on it I would stick with the low detergent single weight oils.Nice job on that oil filter Ace. With some plumbing you could probably use it on the Trailblazer. ERC